Major depressive disorder is a, well, major disorder. It has symptoms that affect a person in the long-term more than the short term (that is a generalization, it is much more complex than that)
Anyways, having little interest in activities which a person once enjoyed is a key symptom. Hot&dizziness, chest tightness, and sweating may go along with MDD, but they are generally seen in Generalized anxiety disorder or social anxiety disorder.